• Journal of Industrial Convergence
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• v.22 no.2
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• pp.23-32
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• 2024

This study utilized minimum number of demographic variables and first-semester GPA of students to predict the final academic status of students at a vocational college in Seoul. The results from XGBoost and LightGBM models revealed that these variables significantly impacted the prediction of students' dismissal. This suggests that early academic performance could be an important indicator of potential academic dropout. Additionally, the possibility that academic years required to award an associate degree at the vocational college could influence the final academic status was confirmed, indicating that the duration of study is a crucial factor in students' decisions to discontinue their studies. The study attempted to model without relying on psychological, social, or economic factors, focusing solely on academic achievement. This is expected to aid in the development of an early warning system for preventing academic dropout in the future.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.42 no.2
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• pp.94-103
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• 2019

Self Organizing Map (SOM) is a neural network that is effective in classifying patterns that form the feature map by extracting characteristics of the input data. In this study, we propose an algorithm to determine the cell formation and the machine layout within the cell for the cell formation problem with operation sequence using the SOM. In the proposed algorithm, the output layer of the SOM is a one-dimensional structure, and the SOM is applied to the parts and the machine in two steps. The initial cell is formed when the formed clusters is grouped largely by the utilization of the machine within the cell. At this stage, machine cell are formed. The next step is to create a flow matrix of the all machine that calculates the frequency of consecutive forward movement for the machine. The machine layout order in each machine cell is determined based on this flow matrix so that the machine operation sequence is most reflected. The final step is to optimize the overall machine and parts to increase machine layout efficiency. As a result, the final cell is formed and the machine layout within the cell is determined. The proposed algorithm was tested on well-known cell formation problems with operation sequence shown in previous papers. The proposed algorithm has better performance than the other algorithms.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.2
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• pp.207-212
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• 2022

The rail transport system is developing into a smart railroad that pursues intelligence beyond the automation stage of each component in recent years. Smart railways based on ICT (: Information & Communications Technology) technologies such as IoT (: Internet of Things), big data, deep learning, AI (: Artificial Intelligence), and block chain are expected to cause many developmental changes in domestic and foreign railway technologies. In this paper, we look at the domestic and international standardization trends of railway communication technology, which forms the basis of such smart railway system, and discuss the direction for train control technology(CBTC) in Korea's railway transportation system to become a leading technology(UBTC) in the world railway industry in the future.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.3
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• pp.521-528
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• 2022

The beginning of a new railroad history is progressing every year. Seoul's Sillim Line is a new transportation system based on communication technology. Sillim Line is the nation's first wireless communication-based unmanned train control system based on KTCS-M, the national standard. The use of wireless communication technology in the rail transportation system suggests the possibility of exporting to the global rail market. This is the result of the government's development and implementation of various support policies for nurturing the domestic railway industry and for export. In this paper, the status of support for localization of railroad industry technology implemented by the state is reviewed, and the process by which railroad parts are replaced by localized parts is analyzed out of dependence on foreign countries. A study was conducted on the development of a technical support platform to solve the technical difficulties of the industry that occurred in this process.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.6
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• pp.1069-1074
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• 2021

Recently, mobile communication technology has new eras with supply of 5G commercial communication. 5G mobile communication service is currently supplied with city area, services will be quickly expanded to entire area of country. This mmWave based 5G mobile communication is under spreading for human communication with voice and Internet service. After completion of construction of this human communication, this technology will be expanded to industrial communications. Railway communication system is an example of this industrial communications. In this, performance of traffic transmission for railway communication network based on this 5G railway communication networks will be analyzed with computer simulations. Construction requirements of 5G railway communication networks will be suggested with this analysis results.

• Journal of Engineering Education Research
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• v.5 no.2
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• pp.86-96
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• 2002

Recently, there have been a number of voices from industry that control education at the university is too theoretical and so university graduates are lack of practical ability to apply the control idea to actual systems. In order to reflect these voices, this paper investigates a few examples of successful control education in Asian countries, and presents a modern curriculum of control education, and an effective methodology of control education. For effective control education, we need design and simulation practices of control system using computer software packages, and hands-on experiments using physical hardware plants. The experimental setups should be rugged and reliable to prevent from the breakdown by the students who are non-experts in dealing with hardwares and softwares.

• Journal of the Korean Society of Industry Convergence
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• v.24 no.6_2
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• pp.801-808
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• 2021

In this paper, a numerical analysis was conducted on the effect of the flow control valve of a oscillation water column(OWC) type wave power generator turbine. The OWC wave power turbine operates with compressed air in the air chamber according to the change of wave height. When the wave height changes rapidly, a flow control valve is required due to overload of the turbine and reduced efficiency. Therefore, in this paper, a flow control valve with an opening angle of 60 degrees was installed in the front of the turbine, and the pressure drop, torque, and overall performance were calculated according to the change of turbine RPM and flow rate of turbine inlet. In conclusion, the flow control valve with an opening angle of 60 degrees affects when the turbine rotates at low rotation and the inlet flow rate is large. But it does not have a significant effect on overall turbine performance and it is necessary to find the optimal angle in the future works.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.21 no.2
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• pp.64-72
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• 2022

Gear designers need to select the proper tolerances for deviations in both the center distance and parallelism of axes because these deviations cause high stresses and lead to fatigue breakage of the teeth. In this study, a three-dimensional finite element analysis model was developed for a helical gear used in metro vehicles, and a bending stress analysis method for gear pairs was established according to the contact position change. Using this model, the effect of shaft misalignment due to the center distance and shaft parallelism deviations on the bending stress of the gear was analyzed. As a result, the magnitude of the bending stress changed nearly linearly with the change in the center distance deviation. The tooth contact of the helical gear is biased toward the end of the tooth width when the parallelism deviations of the shaft occur, and the tooth root bending stress increases.

• The Korean Journal of Franchise Management
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• v.3 no.2
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• pp.39-54
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• 2012

Franchise system in Korea has been developed in different way compared with American way of franchising based on mutual contract and intellectual property context. Korean franchising is mostly based on product distribution franchise concept rather than business format franchise in which franchisor makes revenue sources from providing their products as much as possible thru group purchasing and logistics rather than receiving royalty. Many franchise enterprises from Korea drive to enter into global franchise market based on the successful performance of Korean way of franchising. Korean enterprises are required to prepare completely for research and survey regarding local culture, custom, way of life and legal matters etc. when entering into global franchise market to gain a substantial performance. CaffeBene recently entered into American franchise business with success, and many other Korean franchise enterprises have a deep interest in proceeding with global franchise business modeling CaffeBene case. There is no Korean franchise enterprise in United Kingdom in which service franchise area in particular with personal service is considered to become a promising and potential franchise business and many people show a great interest in Oriental foods and beverages with well-being trend. Korean franchise enterprises have now access to United Kingdom easier because IT industry including internet of the country have been developed by leaps and bounds since London Olympic in 2012. The purpose of this study is to suggest key success factors and basic strategy such as situation analysis, selecting business format, and marketing strategy for successful launching of franchise business in United Kingdom.

• (The) Research of the performance art and culture
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• no.35
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• pp.9-59
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• 2017

This article describes the entertainment business system from 1907 to the first half of the 1920's. The entertainment business began at the time of Empire of Korea with the Imperial Theater called Hyeomnyulsa, which was supported by the emperor's authority and national system and run by the imperial court, especially Gungnaebu. However, after closing the imperial theater, many commercial theaters have been born since 1907, the role of the subject who dominate the entertainment business has been subdivided into financialist and agent. The financialist was replaced by civilians and the capacity of the agent has been strengthened after the introduction of Yeongeukgaeryanglon. In this condition the entertainment business had to be rationalized. In addition, before and after 1912, as the businessmen took part in the entertainment business instead of the government officials and social leaders, the role of entertainment business developed and became equipped with a modern system. Financialist who utilized economic capital was subdivided into the proprietor of a theater, investors, and bosses in the process of mobilizing the necessary funds for the construction, renovation, and repair of the theater, and agents who used cultural capital to practice and maintain performances, on the other hand played a role in expanding the diversity of the show in and outside the theater. In the theatre there was Chongmoo, Johapjang, Chwiche, and Jwadang of Gisaengjohaps, Sinpageukdans, Gyeongseonggupabaeujohap and various XXX Ilhaeng were outside the theater. They participated in the their own way. The financialist and agent used to set up cooperative relations and conflicts. The entertainment business was deepened and developed in the process of resolving the conflicts. However, Performance market could not grow as well as the possibility of a system equipped after 1915. This is because the Japanese imperialists limited the growth of the economic capital and cultural capital of the Koreans and even the composition of social capital. For this reason, Chosun's entertainment business system has grown in proportion to the absolute growth of the box office industry, but it has not developed as much as its potential capacity.